mirror of https://github.com/openssl/openssl
115 lines
4.0 KiB
Plaintext
115 lines
4.0 KiB
Plaintext
=pod
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=head1 NAME
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BIO_lookup_type,
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BIO_ADDRINFO, BIO_ADDRINFO_next, BIO_ADDRINFO_free,
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BIO_ADDRINFO_family, BIO_ADDRINFO_socktype, BIO_ADDRINFO_protocol,
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BIO_ADDRINFO_address,
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BIO_lookup_ex,
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BIO_lookup
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- BIO_ADDRINFO type and routines
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=head1 SYNOPSIS
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#include <sys/types.h>
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#include <openssl/bio.h>
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typedef union bio_addrinfo_st BIO_ADDRINFO;
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enum BIO_lookup_type {
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BIO_LOOKUP_CLIENT, BIO_LOOKUP_SERVER
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};
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int BIO_lookup_ex(const char *host, const char *service, int lookup_type,
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int family, int socktype, int protocol, BIO_ADDRINFO **res);
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int BIO_lookup(const char *node, const char *service,
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enum BIO_lookup_type lookup_type,
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int family, int socktype, BIO_ADDRINFO **res);
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const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai);
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int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai);
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int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai);
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int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai);
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const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai);
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void BIO_ADDRINFO_free(BIO_ADDRINFO *bai);
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=head1 DESCRIPTION
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The B<BIO_ADDRINFO> type is a wrapper for address information
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types provided on your platform.
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B<BIO_ADDRINFO> normally forms a chain of several that can be
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picked at one by one.
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BIO_lookup_ex() looks up a specified B<host> and B<service>, and
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uses B<lookup_type> to determine what the default address should
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be if B<host> is B<NULL>. B<family>, B<socktype> and B<protocol> are used to
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determine what protocol family, socket type and protocol should be used for
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the lookup. B<family> can be any of AF_INET, AF_INET6, AF_UNIX and
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AF_UNSPEC. B<socktype> can be SOCK_STREAM, SOCK_DGRAM or 0. Specifying 0
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indicates that any type can be used. B<protocol> specifies a protocol such as
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IPPROTO_TCP, IPPROTO_UDP or IPPORTO_SCTP. If set to 0 than any protocol can be
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used. B<res> points at a pointer to hold the start of a B<BIO_ADDRINFO>
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chain.
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For the family B<AF_UNIX>, BIO_lookup_ex() will ignore the B<service>
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parameter and expects the B<node> parameter to hold the path to the
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socket file.
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BIO_lookup() does the same as BIO_lookup_ex() but does not provide the ability
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to select based on the protocol (any protocol may be returned).
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BIO_ADDRINFO_family() returns the family of the given
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B<BIO_ADDRINFO>. The result will be one of the constants
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AF_INET, AF_INET6 and AF_UNIX.
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BIO_ADDRINFO_socktype() returns the socket type of the given
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B<BIO_ADDRINFO>. The result will be one of the constants
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SOCK_STREAM and SOCK_DGRAM.
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BIO_ADDRINFO_protocol() returns the protocol id of the given
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B<BIO_ADDRINFO>. The result will be one of the constants
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IPPROTO_TCP and IPPROTO_UDP.
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BIO_ADDRINFO_address() returns the underlying B<BIO_ADDR>
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of the given B<BIO_ADDRINFO>.
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BIO_ADDRINFO_next() returns the next B<BIO_ADDRINFO> in the chain
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from the given one.
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BIO_ADDRINFO_free() frees the chain of B<BIO_ADDRINFO> starting
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with the given one.
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=head1 RETURN VALUES
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BIO_lookup_ex() and BIO_lookup() return 1 on success and 0 when an error
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occurred, and will leave an error indication on the OpenSSL error stack in that
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case.
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All other functions described here return 0 or B<NULL> when the
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information they should return isn't available.
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=head1 NOTES
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The BIO_lookup_ex() implementation uses the platform provided getaddrinfo()
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function. On Linux it is known that specifying 0 for the protocol will not
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return any SCTP based addresses when calling getaddrinfo(). Therefore, if an SCTP
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address is required then the B<protocol> parameter to BIO_lookup_ex() should be
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explicitly set to IPPROTO_SCTP. The same may be true on other platforms.
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=head1 HISTORY
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The BIO_lookup_ex() function was added in OpenSSL 1.1.1.
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=head1 COPYRIGHT
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Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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